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                           Astronomy Picture of the Day   
      
       Discover the cosmos! Each day a different image or photograph of our   
         fascinating universe is featured, along with a brief explanation   
                       written by a professional astronomer.   
      
                                  2025 January 21   
       The buildings of a city are seen past a dark waterway. Over the city   
      are some dark clouds and above that, blue sky. In the blue sky, partly   
         obscured by some of the clouds, is a comet with a very long tail,   
          running from the middle to the top of the frame. Please see the   
                    explanation for more detailed information.   
      
                             Comet ATLAS over Bras+¡lia   
                           Image Credit: Frederico Danin   
      
      Explanation: What's that in the sky? Above the city, above most clouds,   
      far in the distance: it's a comet. Pictured, the impressive tail of   
      Comet C/2024 G3 (ATLAS) was imaged from Bras+¡lia, Brazil four days ago.   
      Last week the evolving comet rounded the Sun well inside the orbit of   
      planet Mercury, going so close there was early concern that it might   
      break up -- and recent evidence that it really did. At one point near   
      perihelion, Comet ATLAS was so bright that sightings were even reported   
      during the day -- over the bright sky near the Sun -- by careful   
      observers. Over the past few days, Comet ATLAS has developed a long   
      tail that has been partly visible with unaided eyes after sunset, most   
      notably in Earth's southern hemisphere.   
      
                         Growing Gallery: Comet ATLAS (G3)   
                           Tomorrow's picture: up north   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
   --- BBBS/Li6 v4.10 Toy-7   
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